OSHAWA -- One student was taken to hospital with unknown injuries after a fight broke out across from Paul Dwyer Catholic High School.

Police were on scene and students from both Dwyer and nearby R.S. McLaughlin Collegiate were milling around in the parking lot of a plaza at Stevenson and Rossland roads in Oshawa after a fight left one Dwyer student in hospital.

"There was a high school fight, we don't really know what it was about at this point, none of the witnesses seem to know," said Durham Regional Police Sergeant Shawn McCurdie at the scene. "One student has been taken to hospital but we don't know the extent of his injuries."

Sgt. McCurdie said a suspect in the fight is known, but was not in police custody at the time.

One witness to the fight, a Grade 9 Dwyer student, said a Grade 12 student "picked up" a fellow Grade 9 student and "smashed his head off the curb," before running away.

While she wasn't sure what the fight was about, the witness said the Grade 9 student was injured, "all we know is he's in a seizure and on his way to the hospital."